//------------------------------------------------------------------------------
//  此代码版权（除特别声明或在XREF结尾的命名空间的代码）归作者本人若汝棋茗所有
//  源代码使用协议遵循本仓库的开源协议及附加协议，若本仓库没有设置，则按MIT开源协议授权
//  CSDN博客：https://blog.csdn.net/qq_40374647
//  哔哩哔哩视频：https://space.bilibili.com/94253567
//  Gitee源代码仓库：https://gitee.com/RRQM_Home
//  Github源代码仓库：https://github.com/RRQM
//  API首页：https://touchsocket.net/
//  交流QQ群：234762506
//  感谢您的下载和使用
//------------------------------------------------------------------------------

using System.IO;
using System.Text;

namespace TouchSocket.Core;

/// <summary>
/// MD5相关操作类
/// </summary>
public static class MD5
{
    /// <summary>
    /// 从字符串获取MD5值
    /// </summary>
    /// <param name="str"></param>
    /// <returns></returns>
    public static string GetMD5Hash(string str)
    {
        var sb = new StringBuilder();
        using (var md5 = System.Security.Cryptography.MD5.Create())
        {
            var data = md5.ComputeHash(Encoding.UTF8.GetBytes(str));
            var length = data.Length;
            for (var i = 0; i < length; i++)
            {
                sb.Append(data[i].ToString("X2"));
            }
        }
        return sb.ToString();
    }

    /// <summary>
    /// 从流中获取MD5值。
    /// </summary>
    /// <param name="stream"></param>
    /// <returns></returns>
    public static string GetMD5Hash(Stream stream)
    {
        var sb = new StringBuilder();
        using (var crypto = System.Security.Cryptography.MD5.Create())
        {
            var data = crypto.ComputeHash(stream);
            var length = data.Length;
            for (var i = 0; i < length; i++)
            {
                sb.Append(data[i].ToString("X2"));
            }
        }
        return sb.ToString();
    }

    /// <summary>
    /// 从字节获取MD5值
    /// </summary>
    /// <param name="buffer"></param>
    /// <param name="offset"></param>
    /// <param name="length"></param>
    /// <returns></returns>
    public static string GetMD5Hash(byte[] buffer, int offset, int length)
    {
        var sb = new StringBuilder();
        using (var md5 = System.Security.Cryptography.MD5.Create())
        {
            var data = md5.ComputeHash(buffer, offset, length);
            var count = data.Length;
            for (var i = 0; i < count; i++)
            {
                sb.Append(data[i].ToString("X2"));
            }
        }
        return sb.ToString();
    }

    /// <summary>
    /// 从字节获取MD5值
    /// </summary>
    /// <param name="buffer"></param>
    /// <returns></returns>
    public static string GetMD5Hash(byte[] buffer)
    {
        return GetMD5Hash(buffer, 0, buffer.Length);
    }

    /// <summary>
    /// 验证MD5值。
    /// </summary>
    /// <param name="str"></param>
    /// <param name="hash"></param>
    /// <returns></returns>
    public static bool VerifyMD5Hash(string str, string hash)
    {
        var hashOfInput = GetMD5Hash(str);
        return hashOfInput.CompareTo(hash) == 0;
    }
}